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Giardiello et al. (1993) and Piantadosi (1997) describe the
results of a placebo-controlled trial of a non-steroidal anti-inflammatory
drug in the treatment of familial andenomatous polyposis (FAP).
The trial was halted after a planned interim analysis had suggested
compelling evidence in favour of the treatment.
Here we are interested in assessing whether the number of colonic polyps at
12 months is related to treatment and age of patient.